前端页面index.php
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>登陆</title>
</head>
<body>
<div align="center">
<form name="login" action="index.php" method="post">
<p>用户名<input type=text name="name"></p>
<p>密 码<input type=password name="password"></p>
<p><input type="submit" name="submit" value="登录">
</p>
</form>
<?php
$name = $_POST["name"];
$password = $_POST["password"];
if(isset($name) && isset($password)){
setcookie("name","$name",time()+3600);
setcookie("password","$password",time()+3600);
header("refresh:0;url=success.php");
}
?>
</div>
</body>
</html>
后端判断success.php
<?php
if (!isset($_COOKIE["name"]) || !isset($_COOKIE["password"])) {
echo('账号密码不能为空');
header("refresh:1;url=index.php");
}
elseif ($_COOKIE["name"]!='xiaowang'||$_COOKIE["password"]!='wangmima') {
echo '账号密码不正确';
header("refresh:1;url=index.php");
}
else{
echo "登录成功";
echo '<a href="logout.php"><input type="submit" name="submit" value="注销"></a>';
}
?>
当用户没有输入账号密码时，将会显示账号密码不能为空，且1秒后返回登录页面
同理，账号不为xiaowang，密码不为wangmima时返回账号密码
输入成功时跳转到成功页面
注销页面logout.php
<?php
if (isset($_COOKIE["name"]) || isset($_COOKIE["password"])) {
setcookie("name", "", time()-3600);
setcookie("password", "", time()-3600);
echo '<span id="seconds">3</span>秒后返回到首页 <script type="text/javascript"> // 获取秒数显示id var seconds = document.getElementById("seconds"); // 设置秒数 var num = 3; var timer = setInterval(function () { num--; seconds.innerText = num; if(num == 0){ window.location = "index.php"; } },1000) </script>';
}
else{
echo '未登录';
echo '<br>';
echo '<span id="seconds">3</span>秒后返回到首页 <script type="text/javascript"> // 获取秒数显示id var seconds = document.getElementById("seconds"); // 设置秒数 var num = 3; var timer = setInterval(function () { num--; seconds.innerText = num; if(num == 0){ window.location = "index.php"; } },1000) </script>';
}
?>
当页面存在cookie时，设置时效为当前时间减一小时，即cookie过期。
不存在cookie时，3秒后将会跳转到登录页面
本文地址：https://blog.csdn.net/qq_41679358/article/details/107231428
黄山市民网：https://www.huangshanshimin.com/
